Hello! So I usually don't buy LED lights, but I ended up buying a pair of SVP bumper/grille lights. The guy I bought them from has it marked that the purple wire is for "pattern". The question I have, what do you touch the purple wire to in order to change the pattern?? There's not a model number or anything on them. He also has on the note: red (positive) black (negative) and white (go together). I've used LED light bars before where there is a momentary switch wired in to click in order to change the flash patterns, I just don't know what they temporarily touch the pattern wire to. I'm guessing temporarily touch it to the positive wire?